First Anatomy Lesson...

I was giving Zack a bath today and was leaning over the tub. He was staring at my chest and said, "What's that?"
Being a mom that wants to be honest, I said, "Those are my boobs."
Zack says, "You have two." He pointed at each of them "One, two."
"Yes..." I said.
"What's that?" he said pointing again.
"My cleavage?" looking down to see what he was pointing to.
"Boob package. It's a package for boobs."
I laughed, "Yes, it's called a bra! It is like a package for my boobs!"